Very cool diagram.  Explained things for me perfectly. 

From: "Surgemail Support" <surgemailHIDDEN@t@netwinsite.com>
To: surgemailHIDDEN@etwinsite.com
Sent: Wednesday, May 27, 2015 4:59:20 PM
Subject: Re: [SurgeMail List] Antispam in Surgemail

I have never looked at the antispam features in Surgemail in depth … pardon the question but is it “just” spamassassin under the hood or is it something else?

 

Thanks,

Paul

 

 

It's not related to spamassasin, it's doing a bunch of things to handle spam and can be tuned in various ways. An outline of the method is here:

http://netwinsite.com/surgemail/help/myrbl.htm

ChrisP.